JPH02225881A - Clutch of epicyclic gear system transmission - Google Patents

Abstract

PURPOSE:To make the weight of a clutch lighter and to realize a light weight and a low cost of a transmission by providing splines through which the same clutch drum is geared with clutch plates of at least two clutches. CONSTITUTION:A clutch C1 is provided between an input shaft 3 and a ring gear 7, and a clutch C2 is provided between the input shaft 3 and the first sun gear 6. At the front side inner surface of a clutch drum 21, a spline 23 to gear with the outer clutch plate 22 of the clutch C2 is provided, and at the rear side outer periphery of the first sun gear 6, a spline 25 to gear with the inner clutch plate 24 of the clutch C2 is provided. Since the clutch plates of the clutches C1 and C2 are superposed partially in the radial direction of the clutch drum 21, the diameter of the clutches can be reduced. Since the splines through which the same clutch drum 21 is geared with the clutch plates 22 and 24 of the two clutches C1 and C2 are provided, the clutches can be made in light weight.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a clutch that is a speed change element of a planetary gear type transmission.

<Prior art> Previously, the Ford ATX section of Ford's car cargo manual "Niscoat J (1988 edition)"
An example of a planetary gear transmission is shown. This planetary gear type transmission has a sun gear as shown in Figure 5.
105 and ring gear 103, and is output from carrier 10B. It has an 01 clutch between the input shaft A and the ring gear 103, and an 02 clutch between the implant shaft A and the sun gear 105. Exists. According to this 01 and C2 clutch.

Planetary gear transmission unit l The ring gear 103 that meshes with the old planetary binion 102 is the automatic transmission case 10
A spline extending rearward in the axial direction of 4 and mating with each disc 107 and 111 of the CI clutch and B2 brake.
A drum part 103a having 10B on the outer peripheral side is formed, and a 02 clutch outer drum 1 is installed inside the drum part 103a.
09 is provided, and the drum part 103 of the ring gear 103
A C1 clutch outer drum 110 is provided on the outside of the clutch 103a surrounding the drum portion 103a.

The C2 clutch outer drum 109 has a spline 11 fitted to the clutch plate 111 on the inner peripheral surface of the drum portion.
2, the Cl clutch outer drum 110 has splines 115 on its inner circumferential surface that engage with the clutch plate 1.1.3.

<Problems to be Solved by the Invention> According to the above C1 and C2 clutches, the drum portion 103 of the ring gear 103 that constitutes the C1 clutch inner drum
a and the 02 clutch outer drum 109 are formed separately, and the C1 clutch drum 1.10 is formed outside the drum portion 103a, resulting in an increase in the diameter of the automatic transmission. This increase in diameter is a major drawback when installing an automatic transmission in a car with a small engine room, such as a front-wheel drive car.

Furthermore, since the drum portion 103a of the ring gear 103 and the 02 clutch outer drum 1 port 9 are formed separately, there is a drawback that the manufacturing cost of the automatic transmission increases.

Therefore, two objects of the present invention are to reduce the diameter and weight of the entire planetary gear transmission by reducing the difference in the radial direction between the CI and C2 clutches, and to provide an inexpensive clutch for the planetary gear transmission. be.

<Means for Solving the Problems> To achieve the above object, the present invention provides at least one planetary gear set consisting of a sun gear, a ring gear, and a pinion gear disposed between these two gears and pivoted to a carrier. A planetary gear type transmission having a first clutch provided between an input shaft and a ring gear,
A second clutch is provided between the input shaft and the sun gear, and the ring gear has a drum that is integral with the ring gear and extends rearward in the axial direction of the transmission.

The sun gear is a planetary gear type transmission having a spline that fits with the clutch plate of the second clutch, and a spline that fits with the clutch plate of the first clutch is formed on the inner peripheral side of the drum, and the spline that fits with the clutch plate of the first clutch is formed in the drum. On the front inner circumferential side and the rear outer circumferential side of the clutch drum extending from the rear in the axial direction to the front of the machine, second and first first grooves are arranged adjacent to or overlapping in the radial direction of the clutch drum and adjacent in the axial direction. Forms inner and outer splines that fit with the clutch plates of the clutch, respectively.

A clutch plate of the first clutch is assembled between a drum-side spline integral with the ring gear and an outer spline of the clutch drum, and a clutch plate of the first clutch is assembled between a drum-side spline integral with the ring gear and an inner spline of the clutch drum. 2
It is characterized by the fact that the clutch plate of the clutch is assembled.

Further, the drum integrated with the ring gear includes a cylindrical hub member with an eave that extends rearward in the axial direction of the transmission and whose bottom portion is fixed to one end of the ring gear, and the drum is formed on the inner peripheral side of the hub member. Preferably, a spline is formed to fit with the clutch plate of the first clutch (Claim 2).

Further, the front part of the clutch drum is formed to have a larger diameter than the rear part of the clutch drum, and a stepped surface that comes into contact with the retainer of the clutch plate of the first clutch is formed between the front part and the rear part of the clutch drum. (Claim 3)

Further, a spline that fits with the disc part of the ring gear brake is provided on the outer circumference of the drum integrated with the ring gear, and a piston that presses and releases the disc part is provided behind the disc part. is desirable (
Claim 4).

<Operation> In the radial direction of the clutch drum, since the inner and outer splines are formed adjacent to or overlapping on the same clutch drum, the first clutch (Cl clutch) formed on the outer circumference of the clutch drum ) is reduced in diameter. In addition, a first clutch (Cl clutch) is connected between the inner circumferential side of the drum integrated with the ring gear and the outer circumferential side of the clutch drum.
, the diameter of the first clutch is reduced. Furthermore, since the clutch plates of the two first and second clutches (CI and C2 clutches) are assembled on the same clutch drum, the number of clutch drums is smaller than in the past, and the weight of the clutch is reduced. Therefore, the weight of the entire A-star M vehicle type transmission is reduced (Claim 1).

Further, since the drum integrated with the ring gear is formed of a cylindrical hub member with an eave and the hub member is fixed to the ring gear, it is lightweight and easy to process (Claim 2).

Further, since the step surface of the clutch drum fixes the retainer of the clutch plate, a snap ring is not required (claim 3).

Furthermore, since the piston that operates the disk portion of the ring gear brake is located behind the disk portion, the structure of the piston and the hydraulic circuit are simplified (claim 4).

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4. Inside the transmission case 1 of the automatic transmission, there is a planetary gear transmission unit 2 with a sun gear and ring gear input, and a carrier output type.
is provided. This planetary gear transmission unit 2 includes a first sun gear 6 that is coupled via a one-way clutch 5 to an intermediary diet shaft 4 spline-fitted to an input shaft 3, and a ring gear 7 that meshes with the first sun gear 6. The first planetary pinion 8 that does not mesh with the first
a carrier 9 supporting the planetary pinion 8; and a second i11. ! ld binion 10 and
B1 brake drum 11 meshes with the second planetary pinion 1°
and a second sun gear 12 rotationally coupled to each other. It has an 01 clutch between the input shaft 3 and the ring gear 7.

An 02 clutch is provided between the input shaft 3 and the first sun gear 6. The B1 brake drum 11 is frictionally engaged with the brake band 13, so that the second sun gear 12
to be fixed. The carrier 9 is a counter drive gear 38
and drives the final drive gear 40 via the counter gear 39.

As shown in FIG. 1, the ring gear 7 has a hub disk 14a and a hub drum 14b integrally press-molded, and is electron beam welded to a clutch hub (hub member) 14 extending axially rearward of the transmission case 1. are connected by. A large-diameter cylindrical portion 14d forming the rear end of the hub drum 14b is provided with a spline 16 that fits with the inner brake disc 15 of the B2 brake. This spline 1B also fits into the outer clutch plate 17 of the C1 clutch on its inner peripheral surface. The B2 brake is operated by a press-molded drum-shaped hydraulic piston 19, and the Cl clutch is operated by a press-molded drum-shaped hydraulic piston 20.

Top: The clutch plate portions of the C1 and C2 clutches are housed inside the clutch hub 14. A spline 23 that engages with the outer clutch plate 22 of the C2 clutch is provided on the front inner peripheral surface of the die-cast or cut clutch drum 21 of the C1 and C2 clutches. On the other hand, on the rear outer circumferential side of the first sun gear 6,
A spline 25 is provided that meshes with the inner clutch plate 24 of the C2 clutch. The C2 clutch is operated by a press-molded drum-shaped suitable pressure piston 26.

Clutch drum 2 of the above C1 and C2 clutches! The rear end 21.8 is spline fitted to the intermediate diet shaft 4. A spline 35 that meshes with an inner clutch plate 34 of the Cl clutch is provided on the rear outer peripheral side of the clutch drum 21.

-1: The rear end surface 35a of the periodic spline 35 is recessed forward than the rear end surface of the rear disk 21b of the clutch drum 21, and forms a seat surface against which the retainer 37 of the return spring 36 of the hydraulic piston 20 comes into contact. As shown in FIG. 1, the spline 35 of the Cl clutch is provided inside the spline 23 of the C2 clutch in the radial direction of the clutch drum 21.
The clutch plate part of the 2nd clutch is the clutch drum 2
1 partially overlap in the radial direction. Therefore,
The diameter of the C1 clutch is reduced. Splines 23 and 35
This means that the diameter of the Cl clutch is reduced even when it is close to the clutch drum 21 in the radial direction.

In the clutch drum 21, between the front part where the splines 23 are formed and the rear part where the splines 35 are formed, there is a substantially vertical annular stepped surface 21. C is formed,
The outer peripheral edge of this step surface 21c comes into contact with a portion of approximately 1/2 the diameter of the clutch plate retainer 34a, and the clutch plate retainer 34. a to the clutch drum 21. Therefore.

The snap ring that was required in the past becomes unnecessary.

FIG. 2 shows a skeleton of the structure of an automatic transmission including the above-mentioned planetary gear transmission unit.

In this configuration, the establishment of each range is as shown in Table 1.

From Table 1 onwards, details of the ring gear unit consisting of the ring gear 7 and the clutch hub 14 will be described with reference to FIGS. 3 and 4.

The ring gear 7 is formed as a normal helical gear. An annular step portion 2B is formed on the inner diameter side of the rear end surface of the ring gear 7 and is lower than the other portion of the rear end portion.

The clutch hub 14 is press-molded and has an annular hub disk 14a at the front end.

Continuing from the hub disk 14a, a hub drum 14. It has b. A center hole 27 through which the first sun gear 6 is inserted is formed in the center of the hub disk 14a.

The center hole 27 is connected to the hub disk 14 which is bent forward in the axial direction of the automatic transmission. The assembly is accurately sized and centered by a flanged short cylindrical bushing 29 fixed to the inner diameter side edge 28 of a. Bush 29
constitutes a sliding bearing that is assembled to the outer peripheral surface of the first sun gear 6 and enables relative rotation between the first sun gear 6 and the clutch hub 14.

In the hub disc 14a, three arch-shaped bearing fixing ribs 30 protrude radially outward from the attachment point of the bush 29 toward the front in the axial direction of the automatic transmission, and are arranged equally in the circumferential direction of the hub disc 14a. They are distributed at intervals.

These bearing fixing ribs 30 position and hold the bearing 3L assembled between the hub disk 14a and the carrier 9.

The boundary 14c between the hub disk 14a and the hub drum 14b has a gentle taper, and the boundary 14c
In addition, three substantially arcuate openings 32 are distributed at equal intervals in the circumferential direction of the hub disk 14a.

These openings 32 are for the ring gear and the hub disc 14a.
This is to secure space for electron beam welding. Each of the openings 32 faces a welded portion 33 that is arch-shaped and bent so as to be pushed forward in the axial direction of the automatic transmission.

Each welding portion 33 is electron beam welded to the stepped portion 28 of the ring gear 7.

As mentioned above, the inner spline 23 at the front of the clutch drum 21 and the outer spline 3 at the rear of the clutch drum 21
5 is provided adjacent to or partially assembled with the clutch drum 21 in the radial direction, and adjacent in the axial direction, so the diameter of the Cl clutch becomes smaller, and the diameter of the automatic transmission also becomes smaller. . In addition, the clutch drum 2I extending from the rear in the axial direction of the transmission case 1 to the front into the clutch hub 14 has splines 23 and 35 that engage with the clutch plates 22 and 34 of the 01 and C2 clutches on the inner and outer circumferential sides, respectively. The outer spline 35 cooperates with the spline 16 of the clutch hub 14 to hold the clutch plates 17 and 35 of the C1 clutch, so that the diameter of the 01 clutch is reduced.

Furthermore, since the clutch plate portion of the C1 clutch is arranged with a reduced diameter inside the clutch hub 14 that is integrated with the ring gear, it is possible for the Cl clutch and the 82 brake to overlap in the radial direction of the automatic transmission. , it is possible to shorten the shaft length of the automatic transmission, and the piston 1 operates the disc part of the B2 brake intermittently.
9 can act from the rear side in the axial direction of the automatic transmission, which simplifies the configuration of the two hydraulic circuits. this is.

This reduces the weight and manufacturing cost of automatic transmissions.

<Effects of the Invention> According to the present invention, the inner and outer splines of the same clutch drum are formed adjacent to each other or overlapping each other in the radial direction of the clutch drum, and adjacent to each other in the axial direction. , the diameter of the first clutch (Cl clutch) is smaller than before.

Also, between the inner circumferential side of the drum integrated with the ring gear and the outer circumferential side of the clutch drum extending into the drum from the rear in the axial direction of the transmission, there is a gap between the input shaft and the ring gear.
Since one clutch is configured, the diameter of the C1 clutch is reduced, and an increase in the diameter of the planetary gear type transmission is prevented. Also, if the same clutch drum is connected to at least two 01 and C
Since it has splines that fit with the clutch plates of the two clutches (the clutch between the input gear and the sun gear), the weight of the clutch is reduced and the manufacturing cost of the clutch is reduced.

Il! Claim 1) characterized in that the J'i1 gear type transmission is lightweight and inexpensive.

In addition, since the step surface between the front and rear parts of the clutch drum contacts the retainer of the clutch plate of the first clutch and fixes the retainer to the clutch drum, a conventional snap ring is not required (Claim 3). .

In addition, since the clutch plate portion of the first clutch (Cl clutch) is housed in the drum that is integrated with the ring gear,
It becomes possible to operate the disc portion of the ring gear brake from the rear of the transmission using a hydraulic piston whose diameter is prevented from increasing, and the configuration of the hydraulic piston and the hydraulic circuit can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an automatic transmission incorporating a clutch according to an embodiment of the present invention, Fig. 2 is a skeleton of the power train of the automatic transmission of Fig. 1, and Fig. 3 is , ■ in Figure 1
Fig. 4 is a sectional view taken along the line -IV in Fig. 3, and Fig. 5 is a vertical sectional view of a planetary gear type transmission according to the prior art. It is. 2... Planetary gear transmission unit. 3... Input shaft 6... First sun gear. 7...Ring gear, 14...Clutch hub 14a.
・Hub disk. 14b...Hub drum. 17 and 22...outer clutch plate. 19... Piston, 21... Clutch drum. 218...Step surface. 23, 25 and 35... splines. 24 and 34...Inner clutch plate. 34a...retainer. Applicant Aisin Seiki Co., Ltd. Agent Patent Attorney Asa Kato Road Figure 5

Claims (4)

[Claims] (1) A planetary gear type transmission having at least one planetary gear set consisting of a sun gear, a ring gear, and a pinion gear disposed between these two gears and pivotally supported by a carrier, the transmission having an input shaft and a ring gear. A first clutch is provided between the input shaft and the sun gear, a second clutch is provided between the input shaft and the sun gear, and the ring gear has a drum that is integral with the ring gear and extends rearward in the axial direction of the transmission, The sun gear is a planetary gear type transmission having a spline that engages with the clutch disc of the second clutch, and a spline that engages with the clutch plate of the first clutch is formed on the inner circumferential side of the drum, and the spline that engages with the clutch plate of the first clutch is formed in the drum for speed change. On the front inner circumferential side and the rear outer circumferential side of the clutch drum extending from the rear in the axial direction to the front of the machine, second and first first grooves are arranged adjacent to or overlapping in the radial direction of the clutch drum and adjacent in the axial direction. Inner circumferential side and outer circumferential side splines are formed to respectively fit with the clutch disc of the clutch, and a clutch plate of the first clutch is assembled between the drum side spline integrated with the ring gear and the outer circumferential side spline of the clutch drum. A clutch for a planetary gear type transmission, characterized in that a clutch plate of a second clutch is assembled between a sun gear side spline and an inner peripheral side spline of the clutch drum. (2) The drum integrated with the ring gear includes a bottomed cylindrical hub member that extends rearward in the axial direction of the transmission and has a bottom fixed to one end of the ring gear, and the inner circumference of the hub member. 2. The clutch for a planetary gear type transmission according to claim 1, further comprising a spline formed on a side thereof to engage with a clutch plate of the first clutch. (3) The front part of the clutch drum is formed to have a larger diameter than the rear part of the clutch drum, and a stepped surface that comes into contact with the retainer of the clutch plate of the first clutch is provided between the front part and the rear part of the clutch drum. The clutch for a planetary gear type transmission according to claim 1 or 2, characterized in that the clutch is formed. (4) A spline that engages with the disc part of the ring gear brake is provided on the outer periphery of the drum integrated with the ring gear, and a piston that presses and releases the disc part is provided behind the disc part. The clutch for a planetary gear type transmission according to any one of claims 1 to 3, characterized in that: